Sam Katz, politician-turned-documentary-filmmaker, spoke in front of about 50 millennials at the State of Young Philly’s Great Millennial Mouth-off on Thursday after the workday, and told them, bluntly: You need to vote. If 35,000 of Philadelphia’s millennials vote in the upcoming 2015 mayoral race, he said, things would be a lot different.

“You will decide who the next mayor is,” Katz told the crowd at the ImpactHub at 4th and Thompson streets, a coworking space by day. “You won’t … But if you do, the pace of change will be accelerated.”

Thursday night’s event, sponsored by Young Involved Philly and The Philadelphia Citizen, was about those “ifs.” Over beer and snacks, participants were asked to think of ways to make a better Philadelphia through education, city planning and economic growth and write their ideas on stickers. And that’s the best way to tell this story, frankly — so here’s how some of Philadelphia’s young people want to see the city change:

Education 

City planning

Economic growth